Roll for crushing-mills



(No Model.)

A. s. HOBBY, ROLL FOR URUSHING MILLS.

Patented Au H 4 by Affy.

hairs Srarns FFECE.

ROLL FOR CRUSHlNG-MILLS.

SPECIFICATION forming part of Letters Patent No; 303,280, dated August 12, 1884.

Application filed August 11, 1883. No Model.)

1T0 aZZ whom, it may concern Be it known that LAnrnnn S. HOBBY, a citizen of the United States, residing at Cincinnati, Ohio, have invented new and useful Improvements in Rolls for Grushinghlills, of

which the following'is a specification.

My invention relates to roller crushingmills used for various purposes in the arts, its object being to enhance their usefulness and ellicicncy by an improved form and construction of the rolls.

To this end my invention consists in certain constructions and combinations of parts, as hereinafter pointed out and claimed.

Mechanism embodying my invention is illustrated in the accompanying drawings, in which Figure 1 is a cross-sectional elevation of a crushing'mill employing a pair of rolls. Fig. 2 is aplan view of a mill, showing two of the roller constituents in axial section. Fig.

3 is a partial view of contiguous rolls, one of which has its corrugations somewhat inclined to the perpendicular plane of division, the inclination being in excess of that shown in Fig. 2.

The parts herein referred to are designated upon the drawings by letters of reference.

The hopper A is of the usual or any de 1 sired construction, its inclined side walls,

which guide the material to the rolls, having their lower edges molded or notched in such form as to correspond to the contour of the rolls. The rolls B B are formed with peripheral corrugations, consisting of alternate ribs and grooves in circumferential planes, these registering on adjacent rolls, as indicated in Fig; 2thc rib of one with the groove of its opposite. By this construction it will be apparent that not only is there a larger amount of crushing-surface in a given length of roll than if the rolls were cylindrical, but that a grinding or abrading action is introduced-by the relative sliding action of portions ofthe surfaces. This function is rendered more cfficient by giving to the corrugations of one of the rolls a slight inclination to the axis, as indicated at B Fig. 3. The periphery of the roll-sections will thus have what is known as a staggered motion-2 6., a longitudinal oscillation-when the shaft rotates, which will also assist to agitate the superincumbent material and prevent packing, thereby insuring a more regular feed. The rolls are preferably made by casting the body of the roll in separate sections, 1), divided in planes slightly oblique as to one of the rolls and perpendicular in the other to the common axis, and perforated for mounting upon a shaft, 0. These sections may be cast hollow, as at b, or solid, as at I), Fig. 2, as may be desired. They are placed upon theshaft side by side, and are preferably secured together by long bolts (2, extending through the series parallel to the shaft, through suitable perforations for this purpose. It is preferable to use a squared shaft with corresponding perforations in the roller setions, and while the shaft is generally passed through the rolls centrally, it will be obvious that the rolls may be arranged ccccntrically to each other, if desired.

The form, of the corrugations maybe varied at will; and it willbe obvious that thelength of the rolls may be also varied at will by in creasing or diminishing the number of the sections and the length of the shaft. The rollshafts are preferably set in Sliding hearings to take up lost motion and regulate the space between the rolls; and worn-out rolls may be at any time renewed byreplacing the sections 1). In the present instance I have shown the rolls BB provided with interrneshing spurgcars D D at one end only of their shafts;v but similar gearing may be provided at both ends, when the length of the rolls renders it necessary, to avoid twisting strains upon the shafts. Other details of construction of the mill or hopper areconnnon to similar structures, and require no special description.

As'shown in the drawings herewith, the rolls B B are geared to revolve at different speeds; but it is obvious that they may be geared to revolve at the same speed, if desired.

The sections Z1 may be formed of iron or steel, and wrought or cast, as required by the nature of the intended use, halfsections, as shown in Fig. 2, being provided to bring one roll into proper registering relation with its mate.

Iclaim as my invention and desire to secure by Letters Patent 1. The combination, in a roller crushing- .mill, of a roll having corrugations arranged circumferentially with a roll having its corru- IOC) gations arranged slightly oblique to the axis thereof, the two rolls intermeshing, substantially as described, and for the purpose set bination, with a central shaft, of a series of sections which form" corrugations, said corru- I 5 gations arranged obliquely, whereby they have a staggered motion as the shaft rotates and serve to agitate the material, substantially as set forth.

In testimony whereof I have hereunto set my 20 handin the presence of two subscribing witnesses:

- ARTHUR S. HOBBY.

WVitnesses.

L. M. HOSEA, ALEX. HAMILTON. 

